Audiphone



ecc 25,1923, 1,478,545

J. W. BISHOP AUDIPHONE Filed Au 7, 1920 Patented] Dec. as, was.

I access career caries.

'IQQEIR'S W. BISHOP, 0F MUSKEGON, MICHIGAN.

AUDIIPEONE.

I Application filed August 7, 1920. Serial 180. 402,005.

To all whom it may concern.

Be it known that I, JosnPI-r W. Brsnor, a citizen of the United States residing at Muskegon, in the county of Muskegon and State of Michigan, have invented certain new and useful Improvements in Audiphones, of which the following is a specifi cation. I

This invention relates to appliances for facilitating the hearing of partially deaf persons and more particularly to that class of devices generally known as audiphones. The primary object of the invention to provide a receiving device which is eflicient in operation, comfortable to wear, inconspicuous in use, and simple and compact in structure.

A further object is to provide a receiving I device which will rest' lightly within the external ear and be securely held therein by the projecting parts of the ear without pressure, thus eliminating the necessity for unsightly and uncomfortable supporting devices; or parts depending for their su port upon engagement with the delicate w ls o i the auditory canal. In the drawing Fig. 1 is an enlarged perspective view of the invention. F Fig. 2 is a section on the line. 2,-2 of Fig. 3 is an enlarged detail view showing the parts disassembled.

The selected embodiment of the invention shown in the drawing comprises aflat cylindrical casing 5 open at one end and having a centrally located stud 6 formed on the inner end wall thereof and projecting inwardly therefroin. This stud 6 forms the magnetic core and a bobbin 7 provided with the usual winding 8 fits thereove'r. The wires 10 connecting-the winding of this bobbin with the usual transmitter and battery passthrough the perforation 9 in the cylindrical wall of'the casing.

A ring :or annular shoulder 11 is formed on the inner cylindrical wall of the easing slightly in front of the end face of the bobbin. This shoulder 11 forms the seat for a thin steel diaphragm '12 which is held against the seat by the end plate 13.

The end plate 13 has its outer ed late and correspondingly threaded cylindrical wall .out departing p tion turned inwardly at substanti a lly a :right angle to the body of the "its periphery threaded to fit within the of the casing 5. This inwardly turned edge portion of the plate 13 presses against the outer edge portion of the diaphragm leaving the body of the diaphragm free to vibrate. I

The plate 13 is preferably made of brass or'other non-magnetic material and a tube 14, communicating with the interior of the casing,'is formed on the outer wall thereof. This tube 14 is adapted to enter the auditory canal of the ear.

' The transmitting device and battery form no part of the present invention and are accordingl not shown as any well known type may e used. An induction coil may used in connection with the present invention but it has been clearly demonstrated in practice that such is not necessary.

The direct connection of the outside wires with the coil on the bobbin eliminates terminal posts which are unsightly and add to the weight and cost of the device. While the dimensions of the casing may be varied as required, I have found flatness of the casing and thus the necessity for 'using the unsightly and uncomfortable supports common to this type of device is eliminated. The tube 14 is preferably offset from the center of the end plate to properly position it to enter and rest lightly within the auditory canal. In this way no discomfort is felt by the wearer as there is no. pressure on or distention of the parts of the ear such as frequently is encountered when the device depends wholly or partially for its support upon its engagement with the walls of the canal.

I am aware that changes in the construction and arrangement of parts might readily be made by anyone skilled in the art withfrom the scope of my invention and donot limit myself to the particular embodiment herein shown and escribed. v i

I claim:

1. A receiver foraudiphones comprising a flat cylindrical casing open at one end and adapted to rest within the external car, an

electro-magnetic core formed on theinside wall of the closed end of said casing, a bobbin fitting on said core, a shoulder formed on the inside of the cylindrical wall of said casing intermediate its ends, a diaphragm disposed opposite to said core and seated on said shoulder, an end plate fitting Within the open end of said casing to form a closure therefor and bind said diaphragm upon said seat, and a tubeformed on the outer face of said end plate offset frdin the center thereof and communicating with the interior of said casing.

2. A receiver for audiphones comprising a flat cylindrical casing open at one end an adapted to rest within the external ear, stud on'the inside wall of the closed end of said casing and forming an electro-magnetic core, a bobbin on said stud, an annularshoulder formed on the inside of the cylindrical wall of said casing intermediate its. ends, a diaphragm seated on said shoulder, an end plate having its periphery threaded to fit within the correspondingly threaded. cylindrical wall of the casing against said diaphragm and form a closure for said open end, and a tube formed on the outer face of said end plate offset from the center thereof and communicating with they interior of said casing.

3.,A receiver for audiphones comprising on its seat, and a tube formed -on theouter face of said end plate offset from the center thereof and communicating with the interior of saidcasing.

4. A receiver for audiphones comprising a flat cylindrical casing open at one end and adapted to rest within the external car, a stud on the inside'wall of the closed end of said casing forming an electro-magnetic core, a bobbin fitting on said stud, electrical conductors passing through the cylindrical aaaaeae wall of said casin and engaging the terminals on'said bob in, an annular shoulder formed on the inside of the cylindrical wall of said casin phragm seated on said shoulder, an end plate having its outer edge portion turned inwardly, threads formed on the periphery of said turnedin portion fitting within corre sponding threads in the open end of said casin to form a closure therefor and retain said iaphragm a ainst said shoulder, and a tube formed on t e outer face of said end plate offset from the center thereof and communicating with the interior of said casing.

5. A receiver for audiphones comprising a flat cylindrical casing open at one end and adapted to rest within the external ear and be retained therein by the projecting parts of said ear, a metallic stud on the inside Wall of the closed end of said casing forming an electro-magnetic core, a bobbin fitting: on said stud, electrical conductors passing through the cylindrical wall of said casing and connected to the terminals of the windintermediate its ends, a, dlaing on said bobbin, an annular shoulder formed on the inside of thecylindrical wall diaphragm tting' within said casing and seated on the'opposite-side of said shoulder from said bobbin, a disk of non-magnetic material having its edge portion turned inwardly at substantially a right angle to the inner face of the disk and its periphery threaded to fit within the correspondingly threaded open end of said casin to form a closure for said end, said turne -in portion '80 of said casin intermediate its ends, a steel contacting with said diaphragm to retain a said diaphragm on its seat, and a tube formed on the outer face of said disk offset 1 from the center thereof and communicating 'with the interior of said casing.

6. A receiver for audiphones comprising a flat cylindrical casing adapted to rest within the external car, an electro-magnetic core disposed in said casing, a bobbin on said core, electrical conductors passing through the wall of said casing and engaging the terminals of said bobbin, a diaphragm in said casing, and a tube formed on the outer face of one end of said casing, ofiset from the center thereof, and communicating with the interior of said casing.

, *a w. Bistros; 

